libavformat/daudenc.c

   1 /*
   2  * D-Cinema audio muxer
   3  * Copyright (c) 2005 Reimar Döffinger
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #include "avformat.h"
  23 #include "mux.h"
  24
  25 static int daud_init(struct AVFormatContext *s)
  26 {
  27     AVCodecParameters *par = s->streams[0]->codecpar;
  28     int ret;
  29
  30     if (par->ch_layout.nb_channels != 6) {
  31         av_log(s, AV_LOG_ERROR,
  32                "Invalid number of channels %d, must be exactly 6\n",
  33                par->ch_layout.nb_channels);
  34         return AVERROR(EINVAL);
  35     }
  36
  37     if (par->sample_rate != 96000) {
  38         av_log(s, AV_LOG_ERROR,
  39                "Invalid sample rate %d, must be 96000\n",
  40                par->sample_rate);
  41         return AVERROR(EINVAL);
  42     }
  43
  44     ret = ff_stream_add_bitstream_filter(s->streams[0], "pcm_rechunk", "n=2000:pad=0");
  45     if (ret < 0)
  46         return ret;
  47
  48     return 0;
  49 }
  50
  51 static int daud_write_packet(struct AVFormatContext *s, AVPacket *pkt)
  52 {
  53     avio_wb16(s->pb, pkt->size);
  54     avio_wb16(s->pb, 0x8010); // unknown
  55     avio_write(s->pb, pkt->data, pkt->size);
  56     return 0;
  57 }
  58
  59 const FFOutputFormat ff_daud_muxer = {
  60     .p.name        = "daud",
  61     .p.long_name   = NULL_IF_CONFIG_SMALL("D-Cinema audio"),
  62     .p.extensions  = "302",
  63     .p.audio_codec = AV_CODEC_ID_PCM_S24DAUD,
  64     .p.video_codec = AV_CODEC_ID_NONE,
  65     .p.subtitle_codec = AV_CODEC_ID_NONE,
  66     .p.flags       = AVFMT_NOTIMESTAMPS,
  67     .flags_internal   = FF_OFMT_FLAG_MAX_ONE_OF_EACH |
  68                         FF_OFMT_FLAG_ONLY_DEFAULT_CODECS,
  69     .init         = daud_init,
  70     .write_packet = daud_write_packet,
  71 };